642670034787 has 32 divisors (see below), whose sum is σ = 1093324896000. Its totient is φ = 368997145920.

The previous prime is 642670034779. The next prime is 642670034791. The reversal of 642670034787 is 787430076246.

It is not a de Polignac number, because 642670034787 - 2³ = 642670034779 is a prime.

It is a super-2 number, since 2×642670034787² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642670034717) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56938362 + ... + 56949647.

It is an arithmetic number, because the mean of its divisors is an integer number (34166403000).

Almost surely, 2^642670034787 is an apocalyptic number.

642670034787 is a deficient number, since it is larger than the sum of its proper divisors (450654861213).

642670034787 is a wasteful number, since it uses less digits than its factorization.

642670034787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113888048 (or 113888042 counting only the distinct ones).

The product of its (nonzero) digits is 9483264, while the sum is 54.

The spelling of 642670034787 in words is "six hundred forty-two billion, six hundred seventy million, thirty-four thousand, seven hundred eighty-seven".